Added env examples and scripts

example env file

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+# NordVPN credentials for Gluetun
+# Get these from: https://my.nordaccount.com/dashboard/nordvpn/ -> Manual Setup
+# These are *service* credentials, not your regular NordVPN login
+NORDVPN_USER=
+NORDVPN_PASSWORD=
+
+# Optional: Comma-separated list of countries (e.g. "United States", "Canada", "Netherlands")
+# Leave unset to use "United States"
+# NORDVPN_SERVER_COUNTRIES=United States